| 摘要 |
<p>A method is provided herein for building an improved positive drive power transmission belt having a plurality of alternating grooves and teeth for meshing with the teeth of a pulley, the drive belt being provided with reinforcing fibers distributed through at least a portion of each tooth. An improved apparatus for building such a belt is also provided herein. The method includes the steps of: wrapping a toothcovering fabric around a cylindrical mold which has circumferentially spaced alternating axial grooves and ridges; wrapping a layer of fiberloaded elastomeric material around the covering fabric; applying pressure in a helical fashion against the elastomeric layer with a pressureapplying member to force at least a portion of both the fiber-loaded elastomeric material and the fabric into the axial grooves and to move a portion of the fiber-loaded elastomeric material away from the fabric in the area of the ridges to allow a later-wound load-carrying cord to lie against the fabric in the area of the ridges; winding a load-carrying cord in helical fashion and in a plurality of turns against the layer of the fiber-loaded elastomeric material; wrapping a layer of elastomeric material over the load-carrying cord to define an assembly; and vulcanizing the assembly under heat and pressure; wherein the pressure applying step and the winding step are carried out simultaneously with the cord being helically wound on a next succeeding turn following the application of pressure in the helical fashion. Such method provides belts with a greater degree of length control than those made by the tooth preform method; and provides belts having greater strength and modulus of the belt teeth than those provided by the flow-through method.</p> |
